Should I have them balanced, I thought they did balance them but I get lots of vibrations when I have them on, and my car doesn't make any vibraions with street tires?

I might be going to the track this weekend, and I don't want to crash or something.

This is my first time experience with slicks.

 

What pressure? Even balanced they feel like a couple of cupcakes back there <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> 19psi and up feels about as good as they are going to get. 15psi and lower is where they feel plain squirrelly imo....